﻿using System;
using System.Security.Cryptography;  
using System.Text;
namespace IPR_TrainMrgSys.DBUtility
{
	/// <summary>
	/// DES加密/解密类。
	/// </summary>
	public class DESEncrypt
	{
		public DESEncrypt()
		{			
		}

		#region ========加密======== 
 
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
		public static string Encrypt(string Text)
        {
            return Encrypt(Text, "zziprcjh");
        }
		/// <summary> 
		/// 加密数据 
		/// </summary> 
		/// <param name="Text"></param> 
		/// <param name="sKey"></param> 
		/// <returns></returns> 
		public static string Encrypt(string Text,string sKey) 
		{ 
			DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 
			byte[] inputByteArray; 
			inputByteArray=Encoding.Default.GetBytes(Text); 
			des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8)); 
			des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8)); 
			System.IO.MemoryStream ms=new System.IO.MemoryStream(); 
			CryptoStream cs=new CryptoStream(ms,des.CreateEncryptor(),CryptoStreamMode.Write); 
			cs.Write(inputByteArray,0,inputByteArray.Length); 
			cs.FlushFinalBlock(); 
			StringBuilder ret=new StringBuilder(); 
			foreach( byte b in ms.ToArray()) 
			{ 
				ret.AppendFormat("{0:X2}",b); 
			} 
			return ret.ToString(); 
		} 

		#endregion
		
		#region ========解密======== 
   
 
  //      /// <summary>
  //      /// 解密
  //      /// </summary>
  //      /// <param name="Text"></param>
  //      /// <returns></returns>
		//public static string Decrypt(string Text) 
		//{
  //          return Decrypt(Text, "litianping");
		//}
		///// <summary> 
		///// 解密数据 
		///// </summary> 
		///// <param name="Text"></param> 
		///// <param name="sKey"></param> 
		///// <returns></returns> 
		//public static string Decrypt(string Text,string sKey) 
		//{ 
		//	DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 
		//	int len; 
		//	len=Text.Length/2; 
		//	byte[] inputByteArray = new byte[len]; 
		//	int x,i; 
		//	for(x=0;x<len;x++) 
		//	{ 
		//		i = Convert.ToInt32(Text.Substring(x * 2, 2), 16); 
		//		inputByteArray[x]=(byte)i; 
		//	} 
		//	des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8)); 
		//	des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8)); 
		//	System.IO.MemoryStream ms=new System.IO.MemoryStream(); 
		//	CryptoStream cs=new CryptoStream(ms,des.CreateDecryptor(),CryptoStreamMode.Write); 
		//	cs.Write(inputByteArray,0,inputByteArray.Length); 
		//	cs.FlushFinalBlock(); 
		//	return Encoding.Default.GetString(ms.ToArray()); 
		//}



        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Decrypt(string Text)
        {
            return Decrypt(Text, "zziprcjh");
        }
        /// <summary> 
        /// 解密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Decrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Encoding.Default.GetString(ms.ToArray());
        }



        #endregion


    }
}
